I host hornes.org on Jumpline.com, who recently did a massive upgrade across their entire system. New mail services, new account management, new backbone connectivity, new servers, etc. They did not send out any advance warning… they just did it. The first sign of trouble was when they restored a two-week old view of our content after the upgrade. Then the email woes began, followed by the disk allocation problems, followed by multiple restorations of the site content to various backups, each time wiping out any new content posted.
It has not been pleasant. However, the new services are excellent, and the servers run significantly faster, and the price remains terrific. I have been holding off on any new blog posts since it was likely that they would be wiped out anyway. Hopefully, the pain is behind us.